FBI recovered Dzhokhar Tsarnaev's laptop

Authorities are hoping to find new clues in the Boston Marathon bombing case by poring over a laptop belonging to suspect Dzhokhar Tsarnaev and learning what his brother, Tamerlan, told his wife, Katherine Russell, in a phone call days after the blast, ABC News reported.

Robert Stahl, an attorney for a friend of Dzhokhar, told ABC News his client had taken Dzhokhar's laptop from his room but turned it over to the FBI "the very first time" agents came to see him four days after the bombing.

Stahl's client, 19-year-old Dias Kadyrbayev, was charged along with 19-year-old Azamat Tazhayakov with conspiracy to obstruct justice for taking the laptop and allegedly trying to dump a backpack full of fireworks -- which had been emptied of their powder -- also belonging to Dzhokhar after they realized Dzhokhar was involved in the bombing.

A law enforcement official also told ABC News Thursday that the FBI is seeking to find out what Tamerlan Tsarnaev told his wife in a phone call shortly after the FBI released his photo to the public three days after the attack. The official said only that Russell knows the content of the conversation.

Russell's attorney said in a statement Tuesday that she was providing "as much assistance to the investigation as she can."

Minute-by-minute: How bombers attacked, evidence hidden

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New information continues to emerge about the two suspects in the Boston Marathon Bombing. Federal documents breakdown how the Boston Bombing suspects reportedly carried out the attack, and show how close friends attempted to hide evidence from investigators.